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crossover question

32.221.222.167

Posted on January 3, 2022 at 18:13:00
Posts: 55
Location: Ct USA
Joined: August 12, 2016









Hi all,

The attached sketches are of outboard 3 way crossovers I designed and built for use with B&W P6 speakers. I'm hoping someone can tell me what order it is or what it would be called. And does it seem a reasonable design? The speakers are connected to a system including an OPPO BDP-95, Audilble Illusions M3A and McCormack Deluxe Edition DNA 0.5 amp.


 

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RE: crossover question, posted on January 3, 2022 at 20:43:26
hahax@verizon.net
Audiophile

Posts: 3918
Location: New Jersey
Joined: March 22, 2006
I'm mystified by the question since you designed the crossover. What did you try to do? Plus from a crossover you can only tell what it is electrically and what matters is what it is acoustically which is also affected by the enclosure and the driver specs and how everything interacts.

 

Looks like a third order Bessel, posted on January 4, 2022 at 06:30:38
airtime
Audiophile

Posts: 11080
Location: Arizona
Joined: February 4, 2003
If you just plugged some numbers into a calculator you may be in for an unpleasant surprise. Building a crossover is a art.

Is there a reason you decided to go with a problematic third order filter?

 

You have a 2 1/2 way with third, second and first order electric filters, posted on January 4, 2022 at 08:46:06
Edp
Audiophile

Posts: 4058
Joined: September 23, 1999
Not a three way but 2.5 way

Better make sure midrange is really a midbass to handle full bass signal

I'd be keeping eye on impedance even in the high frequency range if that is a 56 ohm resistor (some of the values have hard to see "." In them)

 

RE: crossover question, posted on January 4, 2022 at 08:55:17
Davey
Audiophile

Posts: 2342
Joined: September 26, 2013
I'm mystified by the question as well. :)

Dave.

 

RE: crossover question, posted on January 4, 2022 at 09:21:31
neolith
Audiophile

Posts: 4668
Location: Virginia
Joined: February 21, 2002
Contributor
  Since:
December 2, 2004
Maybe I am missing something but I don't see a HP for the mid-driver.
Also labeling the input + and - input jacks as "input" and "output" is misleading and is just wrong. They are both inputs and the + and - designation is arbitrary; it just provides a means of matching the polarity of the drivers (and speakers).
As an aside, IMO, a lot of confusion could have been avoided if the convention would have been to designated the input leads for AC circuits as A and B rather + and -. After 100 yrs or so, it's no use complaining :).



"Our head is round in order to allow our thoughts to change direction." Francis Picabia

 

RE: crossover question, posted on January 4, 2022 at 19:00:29
Posts: 55
Location: Ct USA
Joined: August 12, 2016



You guys got me right. I don't know much about crossovers. But about ten years ago I made outboard XOs for my Sound Dynamics 300 Ti speakers and got lucky. Somehow the result was very good. So I thought I would try to do the same for my B&W P6's. Some of your replies made me reconsider my design and the attachment reflects my lastest design. I do understand that other things such as drivers, enclosure and baffle size will impact results. Now some of your replies said my design was a 2 1/2 way XO. However I would appreciate your repiles and hopefully tell me the order of my latest design and if it is a 3 way design.

Thanks

 

RE: crossover question, posted on January 4, 2022 at 19:14:44
Posts: 55
Location: Ct USA
Joined: August 12, 2016



You guys got me right. I don't know much about crossovers. But about ten years ago I made outboard XOs for my Sound Dynamics 300 Ti speakers and got lucky. Somehow the result was very good. So I thought I would try to do the same for my B&W P6's. Some of your replies made me reconsider my design and the attachment reflects my lastest design. I do understand that other things such as drivers, enclosure and baffle size will impact results. Now some of your replies said my design was a 2 1/2 way XO. However I would appreciate your repiles and hopefully tell me the order of my latest design and if it is a 3 way design.

Thanks

 

RE: crossover question, posted on January 4, 2022 at 19:15:48
Posts: 55
Location: Ct USA
Joined: August 12, 2016



You guys got me right. I don't know much about crossovers. But about ten years ago I made outboard XOs for my Sound Dynamics 300 Ti speakers and got lucky. Somehow the result was very good. So I thought I would try to do the same for my B&W P6's. Some of your replies made me reconsider my design and the attachment reflects my lastest design. I do understand that other things such as drivers, enclosure and baffle size will impact results. Now some of your replies said my design was a 2 1/2 way XO. However I would appreciate your repiles and hopefully tell me the order of my latest design and if it is a 3 way design.

Thanks

 

When you hit the back button, you first post gets posted again. I also, posted on January 4, 2022 at 21:52:20
alaskahiatt
Audiophile

Posts: 6376
Joined: December 9, 2000
Contributor
  Since:
November 1, 2005
found out the hard way. Anyway, one solution is to hold the back button until you see the words Speaker Asylum, then hit that link. Others may have a better solution.

 

RE: crossover question, posted on January 5, 2022 at 00:24:31
KanedaK
Audiophile

Posts: 2101
Location: Brussels
Joined: April 27, 2010
With all due respect, crossover design has to be done by people in the know (I'm not one of them).

 

RE: crossover question, posted on January 8, 2022 at 08:46:41
Posts: 55
Location: Ct USA
Joined: August 12, 2016
They tweeter high pass filter shown in my modified outboard XO B&W P6 diagram is wrong. The tweeter polarity is inverted. See corrected diagram.




 

RE: crossover question, posted on January 8, 2022 at 12:19:11
Posts: 55
Location: Ct USA
Joined: August 12, 2016
They tweeter high pass filter shown in my modified outboard XO B&W P6 diagram is wrong. The tweeter polarity is inverted. See corrected diagram.




 

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